<?php
namespace Common\jiami;
class STD3Des
{
  var $key;
function Crypt3Des($key){
  $this->key = $key;
}

function encrypt($input){
  $size = mcrypt_get_block_size(MCRYPT_3DES,'ecb');
  $input = $this->pkcs5_pad($input, $size);
  $key = str_pad($this->key,24,'0');
  $td = mcrypt_module_open(MCRYPT_3DES, '', 'ecb', '');
  $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
  @mcrypt_generic_init($td, $key, $iv);
  $data = mcrypt_generic($td, $input);
  mcrypt_generic_deinit($td);
  mcrypt_module_close($td);
  //    $data = base64_encode($this->PaddingPKCS7($data));
  $data = base64_encode($data);
  return $data;
}

function decrypt($encrypted){
  $encrypted = base64_decode($encrypted);
  $key = str_pad($this->key,24,'0');
  $td = mcrypt_module_open(MCRYPT_3DES,'','ecb','');
  $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td),MCRYPT_RAND);
  $ks = mcrypt_enc_get_key_size($td);
  @mcrypt_generic_init($td, $key, $iv);
  $decrypted = mdecrypt_generic($td, $encrypted);
  mcrypt_generic_deinit($td);
  mcrypt_module_close($td);
  $y=$this->pkcs5_unpad($decrypted);
  return $y;
}

function pkcs5_pad ($text, $blocksize) {
  $pad = $blocksize - (strlen($text) % $blocksize);
  return $text . str_repeat(chr($pad), $pad);
}

function pkcs5_unpad($text){
  $pad = ord($text{strlen($text)-1});
  if ($pad > strlen($text)) {
    return false;
  }
  if (strspn($text, chr($pad), strlen($text) - $pad) != $pad){
    return false;
  }
  return substr($text, 0, -1 * $pad);
}

function PaddingPKCS7($data) {
  $block_size = mcrypt_get_block_size(MCRYPT_3DES, MCRYPT_MODE_CBC);
  $padding_char = $block_size - (strlen($data) % $block_size);
  $data .= str_repeat(chr($padding_char),$padding_char);
  return $data;
}
}
?>
